फलन का समाकलन कीजिए: $\sqrt{1+\frac{x^{2}}{9}}$

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माना $I = \int \sqrt{1+\frac{x^{2}}{9}} \, dx$.
हम समाकल्य को इस प्रकार लिख सकते हैं:
$I = \int \sqrt{\frac{9+x^{2}}{9}} \, dx = \frac{1}{3} \int \sqrt{9+x^{2}} \, dx = \frac{1}{3} \int \sqrt{3^{2}+x^{2}} \, dx$.
मानक समाकलन सूत्र $\int \sqrt{x^{2}+a^{2}} \, dx = \frac{x}{2} \sqrt{x^{2}+a^{2}} + \frac{a^{2}}{2} \ln |x + \sqrt{x^{2}+a^{2}}| + C$ का उपयोग करते हुए,जहाँ $a = 3$:
$I = \frac{1}{3} \left[ \frac{x}{2} \sqrt{x^{2}+3^{2}} + \frac{3^{2}}{2} \ln |x + \sqrt{x^{2}+3^{2}}| \right] + C$.
$I = \frac{1}{3} \left[ \frac{x}{2} \sqrt{x^{2}+9} + \frac{9}{2} \ln |x + \sqrt{x^{2}+9}| \right] + C$.
$I = \frac{x}{6} \sqrt{x^{2}+9} + \frac{3}{2} \ln |x + \sqrt{x^{2}+9}| + C$,जहाँ $C$ एक स्वेच्छ अचर है।

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